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 Vim has a builtin spelling command. This is how to use it.
 1 - To set a particularly dictionary as default, only for
 markdown and txt files, put this in .vimrc:
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 autocmd FileType txt,text,md,markdown setlocal spell
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 2 - To turn off spell, input:
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 :set nospell
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 3 - For auto-suggest use:
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 z=
 Input enter to exit without changes or input the suggestion
 number.
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 4 - If spell is wrong and the word is correct:
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 zg
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 5 - If you want to mark a word as incorrect:
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 zw
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 https://tinyurl.com/yhgbo57z
 https://tinyurl.com/yg63tq6c